What is CVE-2026-18220?

CVE-2026-18220 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-07-29.

How severe is CVE-2026-18220?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2026-18220 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Red Hat Enterprise Linux 10

CVE-2026-18220

An out-of-bounds write vulnerability was found in the BFD library's DLX ELF backend (bfd/elf32-dlx.c) in GNU binutils. The dlx_rtype_to_howto() function maps ELF relocation types to internal howto structures but fails to perform adequate b…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

4D4J/objdump-Out-Of-Bounds-write

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-18220?: CVE-2026-18220 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-07-29.
How severe is CVE-2026-18220?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2026-18220 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.